Treat this with a healthy pinch of salt, but the One Max will apparently be even more powerful than the One, with a 2.3GHz quad-core chip. Its screen will have the same Full HD 1080p resolution, although as it's stretched from 4.7 to 5.9 inches it'll be slightly less dense, at 373 pixels per inch. That's still plenty more than the iPhone's retina display, so you'll have to look very closely to see individual dots.

Other mooted features include a hefty 3,300mAH battery, the silly BoomSound speakers and UltraPixel camera, in which each pixel is much bigger than those on a normal phone camera sensor. That's supposed to let in more light, but in practice we didn't find the HTC One's photos much better than its direct rivals.

Now, I don't know how many people saw the beautiful HTC One and thought, "you know, it's really nice, but it's not quite big enough for me." But there are bound to be some -- Galaxy Note owners coming to the end of their two-year contracts, for example -- and this will hopefully hit the spot. If it meets the One's terrific build quality, adds more power and doesn't compromise too much on the screen's sharpness, it could be a smash hit.

Even if it's selling half as many as the Galaxy S4, the HTC One is a massive success for the troubled Taiwanese mobile maker and understandably it looks to be squeezing every last drop of value out of its success. An HTC One Mini has been heavily rumoured too, with a similar approach: pretty much the same but a different screen size.

Would you be tempted by a giganto-One? Or is a smaller version more your speed? Give me a shout down in the comments, or over on our supersized Facebook page.